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* From Epidemiology and Biostatistics (Drs. Kauffmann and Annesi-Maesano, and Mss. Le Moual and Siroux), Institut National de la Santé et de la Recherche Médicale (INSERM) U472, Villejuif, France; INSERM U535 (Dr. Dizier), Kremlin-Bicêtre, France; Arnaud de Villeneuve Hospital (Dr. Bousquet), Montpellier, France; INSERM U393 (Dr. Feingold), U155 (Mr. Hochez), and U408 (Dr. Neukirch), Paris, France; Unité propre de Lensignement Supérieur 2051 (Dr. Charpin), Marseille, France; Lyon Sud Hospital (Dr. Gormand), Lyon, France; Trousseau Hospital (Dr. Grimfeld), Paris, France; Centre National de Génotypage (Dr. Lathrop), Evry, France; Cochin Hospital (Dr. Matran), Paris, France; Necker Hospital (Dr. Paty), Paris, France; Albert Michallon Hospital (Dr. Pin), Grenoble, France; and Equipe mixte INSERM 00-06 (Dr. Demenais), Evry, France.
Correspondence to: Francine Kauffmann, MD, Institut National de la Santé et de la Recherche Médicale (INSERM), Epidémiologie Biostatistique U 472, 16 Ave Paul Vaillant Couturier, 94807 Villejuif cedex, France; e-mail: kauffmann{at}vjf.inserm.fr
The
Epidemiologic Study on the Genetics and Environment of Asthma (EGEA)
was planned to assess genetic and environmental risk factors and their
interactions in patients with asthma and for the two related traits of
bronchial hyperresponsiveness and atopy. The study was performed
from 1991 to 1995 and combined a case control study and a study of the
families of the asthmatic patients. A synthesis of the results already
obtained is presented. Smoking was related to IgE levels, even in
asthma patients. Smoking was clearly related to the clinical severity
of the asthma, which is clinically insufficiently taken into
account. The relationships of occupational exposures to asthma
have been assessed using a job exposure matrix. Segregation analyses of
IgE have shown, after correction for the mode of ascertainment,
the existence of a dominant major gene and a familial residual
correlation. A systematic genome screen used in families with two
asthmatic siblings showed a linkage of various regions in the genome
that are related to asthma or related phenotypes (ie, 1p,
11p, 11q, 12q, 13q, 17q, and 19q), results that are in agreement with
those of genome screens used in other studies. Regarding
candidate genes, no association was shown between asthma and the
F508 mutation of the cystic fibrosis gene. The analysis is still in
progress with studies on the heterogeneity of asthma, with refined
genetic studies, and by searching to integrate the results regarding
environmental and genetic factors and studying their
interactions.
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